My car idles rough for about five minutes after starting --up to 1100, but settles down at 5-700 after five minutes, approx. It also jumps up from 1100 during the initial five minutes if I shift out of park to drive or reverse. I searched a bit and found the ovp to be the one item most mentioned in connection with this kind of issue.

I checked mine out and found that it has two fuse slots but only one is present. Should both slots be filled?

Your engine has an automatic idle stabilization system, which should maintain a constant idle speed. When you shift from a drive gear to park the removal of the torque converter load will momentarily raise the idle speed until the valve closes down.

I think the OVP gets blamed for a lot of problems that it's not responsible for. Several have reported that removing and cleaning the idle speed control valve cured or mitigated idle problems. You should also carefully check the rubber air supply hoses into and out of the valve for cracks or breaks as several have reported them in poor condition. One other thing to check is the function of the throttle vavle switch and throttle linkage microswitch, and I found that partially disassembling, cleaning, and lubricating the throttle linkage solved a flaky idle problem I was having about a year ago on my 2.6.

I cleaned the idle control valve with about 1 can of carb cleaner and it idled much better than before. This was the right thing to do.

Now, as you might know already from another thread of mine, the car died on me and is in the shop for repairs. Unofficial list of items replaced to date are: mas, ecu, and ovp. Stay tuned to the other thread for the end of this story.